21443166 has 24 divisors (see below), whose sum is σ = 47099520. Its totient is φ = 7049376.

The previous prime is 21443159. The next prime is 21443167. The reversal of 21443166 is 66134412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6846 + ... + 9473.

It is an arithmetic number, because the mean of its divisors is an integer number (1962480).

Almost surely, 2^21443166 is an apocalyptic number.

21443166 is an abundant number, since it is smaller than the sum of its proper divisors (25656354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443166 is a wasteful number, since it uses less digits than its factorization.

21443166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16400 (or 16397 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21443166 is about 4630.6766244254. The cubic root of 21443166 is about 277.8196559912.

Adding to 21443166 its reverse (66134412), we get a palindrome (87577578).

It can be divided in two parts, 21443 and 166, that added together give a square (21609 = 147²).

The spelling of 21443166 in words is "twenty-one million, four hundred forty-three thousand, one hundred sixty-six".